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# CRISP: Critical Path Analysis of Microservice Traces

This repo contains code to compute and present critical path summary from [Jaeger](https://github.com/jaegertracing/jaeger) microservice traces.

To use first collect the microservice traces of a specific endpoint in a directory (say `traces`).

Let the traces be for `OP` operation and `SVC` service (these are Jaeger termonologies).

`python3 process.py --operationName OP --serviceName SVC -t <path to trace> -o . --parallelism 8` will produce the critical path summary using 8 concurrent processes. 

The summary will be output in the current directory as an HTML file with a heatmap, flamegraph, and summary text in `criticalPaths.html`.

It will also produce three flamegraphs `flame-graph-*.svg` for three different percentile values.

The script accepts the following options:

```

python3 process.py --help

usage: process.py [-h] -a OPERATIONNAME -s SERVICENAME [-t TRACEDIR] [--file FILE] -o OUTPUTDIR

                  [--parallelism PARALLELISM] [--topN TOPN] [--numTrace NUMTRACE] [--numOperation NUMOPERATION]

optional arguments:

  -h, --help            show this help message and exit

  -a OPERATIONNAME, --operationName OPERATIONNAME

                        operation name

  -s SERVICENAME, --serviceName SERVICENAME

                        name of the service

  -t TRACEDIR, --traceDir TRACEDIR

                        path of the trace directory (mutually exclusive with --file)

  --file FILE           input path of the trace file (mutually exclusivbe with --traceDir)

  -o OUTPUTDIR, --outputDir OUTPUTDIR

                        directory where output will be produced

  --parallelism PARALLELISM

                        number of concurrent python processes.

  --topN TOPN           number of services to show in the summary

  --numTrace NUMTRACE   number of traces to show in the heatmap

  --numOperation NUMOPERATION

                        number of operations to show in the heatmap

```

#!/usr/bin/perl -w

#

# difffolded.pl 	diff two folded stack files. Use this for generating

#			flame graph differentials.

#

# USAGE: ./difffolded.pl [-hns] folded1 folded2 | ./flamegraph.pl > diff2.svg

#

# Options are described in the usage message (-h).

#

# The flamegraph will be colored based on higher samples (red) and smaller

# samples (blue). The frame widths will be based on the 2nd folded file.

# This might be confusing if stack frames disappear entirely; it will make

# the most sense to ALSO create a differential based on the 1st file widths,

# while switching the hues; eg:

#

#  ./difffolded.pl folded2 folded1 | ./flamegraph.pl --negate > diff1.svg

#

# Here's what they mean when comparing a before and after profile:

#

# diff1.svg: widths show the before profile, colored by what WILL happen

# diff2.svg: widths show the after profile, colored by what DID happen

#

# INPUT: See stackcollapse* programs.

#

# OUTPUT: The full list of stacks, with two columns, one from each file.

# If a stack wasn't present in a file, the column value is zero.

#

# folded_stack_trace count_from_folded1 count_from_folded2

#

# eg:

#

# funca;funcb;funcc 31 33

# ...

#

# COPYRIGHT: Copyright (c) 2014 Brendan Gregg.

#

#  This program is free software; you can redistribute it and/or

#  modify it under the terms of the GNU General Public License

#  as published by the Free Software Foundation; either version 2

#  of the License, or (at your option) any later version.

#

#  This program is distributed in the hope that it will be useful,

#  but WITHOUT ANY WARRANTY; without even the implied warranty of

#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#  GNU General Public License for more details.

#

#  You should have received a copy of the GNU General Public License

#  along with this program; if not, write to the Free Software Foundation,

#  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#

#  (http://www.gnu.org/copyleft/gpl.html)

#

# 28-Oct-2014	Brendan Gregg	Created this.

use strict;

use Getopt::Std;

# defaults

my $normalize = 0;	# make sample counts equal

my $striphex = 0;	# strip hex numbers

sub usage {

	print STDERR <<USAGE_END;

USAGE: $0 [-hns] folded1 folded2 | flamegraph.pl > diff2.svg

	    -h       # help message

	    -n       # normalize sample counts

	    -s       # strip hex numbers (addresses)

See stackcollapse scripts for generating folded files.

Also consider flipping the files and hues to highlight reduced paths:

$0 folded2 folded1 | ./flamegraph.pl --negate > diff1.svg

USAGE_END

	exit 2;

}

usage() if @ARGV < 2;

our($opt_h, $opt_n, $opt_s);

getopts('ns') or usage();

usage() if $opt_h;

$normalize = 1 if defined $opt_n;

$striphex = 1 if defined $opt_s;

my ($total1, $total2) = (0, 0);

my %Folded;

my $file1 = $ARGV[0];

my $file2 = $ARGV[1];

open FILE, $file1 or die "ERROR: Can't read $file1\n";

while (<FILE>) {

	chomp;

	my ($stack, $count) = (/^(.*)\s+?(\d+(?:\.\d*)?)$/);

	$stack =~ s/0x[0-9a-fA-F]+/0x.../g if $striphex;

	$Folded{$stack}{1} += $count;

	$total1 += $count;

}

close FILE;

open FILE, $file2 or die "ERROR: Can't read $file2\n";

while (<FILE>) {

	chomp;

	my ($stack, $count) = (/^(.*)\s+?(\d+(?:\.\d*)?)$/);

	$stack =~ s/0x[0-9a-fA-F]+/0x.../g if $striphex;

	$Folded{$stack}{2} += $count;

	$total2 += $count;

}

close FILE;

foreach my $stack (keys %Folded) {

	$Folded{$stack}{1} = 0 unless defined $Folded{$stack}{1};

	$Folded{$stack}{2} = 0 unless defined $Folded{$stack}{2};

	if ($normalize && $total1 != $total2) {

		$Folded{$stack}{1} = int($Folded{$stack}{1} * $total2 / $total1);

	}

	print "$stack $Folded{$stack}{1} $Folded{$stack}{2}\n";

}